Casing for spools of photographic film and assembled film cartridges



July 26, 1949. o. A. NEBEL 2,476,996

CASING FOR SPODLS OF PHOTOGRAHIC FILM AND ASSEMBLED FILM CARTRIDGES Filed Dec. 21, 1946 2 Sheets-Sheet I IN V EN TOR. 0s WALD/l .NEBE'IJ ATTORNEY July 26, 1949. o. A. NEBEL 2,476,996

ICASING FOR SPOOLS 0F PHOTOGRAHIO FILM AND ASSEMBLED FILM CARTRIDGES Filed Dec. 21, 1946 2 Sheets-Sheet 2 INVENTOR.

OSMLDANE'BEL BY ATTORNEY aw M126, 949 2,476,996

CASING FOR .SPOOLS OF PHOTOGRAPHIC FILM AND ASSEMBLED FILM CARTRIDGES Oswald A. Nebel, Fords, N. J., asslgnor to 1:. I.

du Pont de Nemuu-s & Company, Wilmington, Del., a corporation of Delaware Application December 21, 1948, Serial No. 717,645

4 Claims.

1 This invention relates to photographic articles and, more particularly, to a novel casing for a spool of photographic film and to an assembled film cartrid e.

An object of this invention is to provide a dur- I2 which have straight grooves l3 and I3 on able and inexpensive film cartridge. Another obtheir inner sides. The lower edge of the body ject is to provide a simple film spool casing which member I has a V-shaped groove I4. can be readily made from die-cast or molded ma- 4 The body member 2 is provided with a reverse terials. Another object is to provide a light-tight tangential lower lip I5 and lateral end flanges casing for a spool of film which can be readily I6 and I6 which slide into the grooves I3 and I3. assembled and disassembled. A further object is Flanges l6 and I6 co-operate with the lower to provide an improved film cartridge which will walls of grooves I3 and I3 so that end walls I1 remain in tight assembled condition during use. and I1 are flush with end walls Band 1. The end Still other objects will be apparent from the folwalls of body member 2 having openings [8 and lowing description of the invention, 88 which likewise form bearing portions for the The novel casing for a spool of photographic u of a film spool. The diametric edges of the film and the assembled cartridge will now be deen Walls have V-shaped points I9 and I9 which scribed with reference to the accompanying interfit with the V-shaped grooves in the end drawing which forms a part of this specification. walls of bo y e r A Piece Of p e t is The same numbers refer to the same parts 20 placed on the reverse tangen l p a d 00-0! throughout the several views. erates with felt 5 to form a light-seal for a piece Fig, 1 is a, perspective iew 01 the various parts of film which is withdrawn between the lips. The of the film cartridge in disassembled relation. bottom edge of body member 2 has a V- h D Fig; 2 is an end elevation of the cartridge; point 2| which interfits with V-shaped groove ll.

Fig. 3 is a sectional view taken along the lines A film spool 22 is provided with a slot 23 which 33 of Fig. 2; is adapted to receive the end of a film element Fig. 4 is a sectional view taken along the lines (not shown) and end flanges 24 and 25 which are 54 of Fig. 3; y spaced so that they bear snugly against the inner Fig. 5 is an inner elevation of one-half of the walls of the body members I and 2 of the casing. film spool casing with the interfitting spoolinele- 3c Spaced a short distance from the two angular vation; flanges are two flanges 26 and 21 of lesser di- Fig. 6 is an inner elevation of one-half 1' th ameter. Grooves 2B and 29 between the flanges casing; interfit with the end walls of the body members Fig. 'I is an end'elevation of one-half of the thus producing effective light-seals along the hub casing; I member. The end of the hub may be provided Fig. 8 is an outer side elevation 01' the other h a key 30 f r en a ment with the camera. half of the casing; Shallow, recessed grooves 3| and 32 are pro- Flg. 9 is an end elevation of the other half of vided in the outer surface of each body member the casing; and a 1 for more than one-half of their peripheral sur- Fig. 10 is a plan view of the other half of the face. A thin spr g p 33 f y al S p casing. fits into each of grooves 3i and 32 and holds the The casing consists of two interfitting 'semibody members and film spool 22 in tightly assemcylindrical shaped body members i and 2, the bled relationship. Various other methods or holdfirst of which has an outer tangential lip portion g the Parts in assembled hip an be I which has an inner, shallow, recessed portion 4 usedthroughout most or its length which is provided Various types of slots or other constructions with a piece of pile-felt 5. The body I is procan be used in the hub members to releasably vided with end walls 6 and I. The semi-circular or fastly attach or join the film element to the ends have openings I and S which are adapted to hub. They may be provided with hook members serve as bearing portions for the hub of a film so which engage with a hole in the end of the film,

2 spool. The walls of said opening are provided with V-shaped grooves l0 and II along their diameter. The end walls extend along the tangential lip with small depending portions I2 and rials include synthetic resins, superpolymers, and

cellulose derivatives, e. g., cellulose acetate, ethyl cellulose, cellulose propionate, cellulose acetopropionate, cellulose ac'etobutyrate, methyl cellu-.

lose, benzyl cellulose; nylons, polystyrene, alkyd resins, cresol-formaldehyde resins, etc.

The plastic compositions can, of course, be modified by the incorporation of various plasticizers, e. g., camphor, aryl phosphates, alkyl phthalates, glycerol, castor oil, etc.; pigments, e. g., lithopone, graphite, carbon black, titanium oxide, phthalocyanine dyes, etc.; fillers, e. g., 'wood flour, diatomaceous earth, etc.

When metals are used die castings, as well as powdered metal molding operations, may beresorted to. Among useful metals are brass and aluminum.

The spools and interfitting casing should be photographically inert so that the film elements 'a" film spool, the bottom and sideedges of said members having interfitting tongues and grooves, one of said body members having a tangentially disposed lip and the other having a reverse tangentially disposed lip between which is a narrow slot for the "passage of a film element, the end walls of said lips having interfitting tongues and grooves, and means for holding said body members in assembled relation.

spooled thereon will not be deleteriously affected.

The spools and interfitting casing can be covered with an inert varnish or lacquer to insure against possible deleterious ingredients in the body thereof.

While the preferred construction of the novel 'film cartridge and casing is shown in the accompanying drawing, the invention is not limited to.

the particular constructions shown. Thus, the two members need not have the particular types of interlocking tongue and grooves shown. The tongues and grooves may be reversed on the body members, if desired.

Various types of resilient materials may be used instead of the pile-felt, e. g., sponge rubber, cellulose sponge, elastomers, silicones, etc.

' In place .of the spring clip for holding the easing and assembled cartridge in light-tight or assembled relation, there may be provided other means. Among such means are molded plastic clips, wire clips, and adhesive tapes of the pressure sealing type. Paper labels may be pasted on the two parts.

The novel film cartridge can be readilyl assembled by winding a film element onto spool 22. A short leader strip or length of film is unwound from the spool and the latter is slipped into casing body member I pressing the leader strip or length of film into contact with the felt of upper lip 3. Casing body member 2 is'then slipped into interfitting relationship with member I and the short length of film or leader allowed to protrude through the opening between the felts on the tangential lips of the casing body members i and 2. The spring clip' is then forced or snapped into the grooves.

The film casing and cartridge of this invention have the advantage that they are simple and easily assembled. They are highly efiective and do not allow light to leak in and expose the film elements. The parts, moreover, do not tend to separate or become loose with ordinary usage. There are no end caps to spring oflE upon dropping which is a disadvantage of prior constructions.

2. A casing for a photographic film cartridge comprising twosemicyclindrical body members which are provided with end walls having semicircular openings adapted to receive the hub of a film spool, one of said body members having a tangentially "disposed lip with end walls containing a V'-shaped groove and having V-shaped grooves in the diametric edges of the end walls and a V-shaped groove in its bottom edge, the other member having a reverse tangentially disposed lip which co-operates with the other lip to form a narrow slot for the passage of a film element, the end walls of said lip having a flange which interlocks with a groove on the end of said first lip to form a light lock, the diametric edges of the end walls and the bottom edge of said other body member being V-shaped to fit in the grooves of the first member and form a light seal, the lips being lined with a resilient material and a spring clip for holding the body in assembled relation.

3. A film cartridge comprising an interfitting casing consisting 'of two semicylindrical body members which are provided with end walls having semicircular openings adapted to receive the hub of a film spool, the bottom and side edges of said members having interfitting tongues and grooves, one of said body members having a tangentially disposed lip and the other having a with the inner end walls of the casing and outerfianges spaced therefrom which abut with the outer end walls of the casing to form a light lock at the openings in said end walls.

4. A film cartridge comprising an interfitting casing consisting of two semicylindrical body members which are provided with end walls having semicircular openings adapted to receive the hub of a film spool, one of said body members having a tangentially disposed lip with end walls containing a V-shaped groove and having V- shaped grooves in the diametric edges of the end walls and a groove in its bottom edge, the other member having a reverse tangentially disposed lip which co-operates with the other lip to form a narrow slot for the passage of a film element, the end walls of said lip having a flange which interlocks with a groove on the end of said first lip to form a light lock, the diametricedges of the end walls and the bottom edge of said other body member being v-shaped to flt in the grooves of the first member and form a light seal. the lips being lined with a resilient material, a spring clip for holding the body'in assembled relation,

9. film spool in said casing provided with flanges which abut with the inner end wallsof the cas- 5 ,1 ,57 ing and outer flanges spaced therefrom which abut with the outer end walls of the casing to Number 1,987,247

form a, light lock at the openings in said 'end Number mus OBWALD A. NEBEL.- 1. 360,050 570,330

REFERENCES CITED The following references are or record in the flle oi this patent: 

